ECONOMIC GEOLOGY
and the
Bulletin of the Society of Economic Geologists
Volume 93 June-July 1998 Number 4

Evolution of an Intrusion-Centered Hydrothermal System: Far Southeast-Lepanto Porphyry and Epithermal Cu-Au Deposits, Philippines
Jeffrey W. Hedenquist, Antonio Arribas, Jr. and T. James Reynolds   pp. 373-404

Geology of the Hope Brook Mine, Newfoundland, Canada: A Preserved Late Proterozoic High-Sulfidation Epithermal Gold Deposit and Its Implications for Exploration
Benoît Dubé,  Greg Dunning and Kathleen Lauzière   pp. 405-436

The Timing of Adularia-Sericite-Type Mineralization and Alunite-Kaolinite-Type Alteration, Mount Skukum Epithermal Gold Deposit, Yukon Territory, Canada: ⁴⁰Ar - ³⁹Ar and U-Pb Geochronology
David A. Love, Alan H. Clark, C. Jay Hodgson, James K. Mortensen, Douglas A. Archibald and Edward Farrar       pp. 437-462

A Multidisciplinary Study of Invisible Bold in Arsenopyrite from Four Mesothermal Gold Deposits in Siberia, Russian Federation
Alexandr D. Genkin, Nikolai S. Bortnikov, Louis J. Cabri, F.E. Wagner, Chris J. Stanley, Yurii G. Safonov, Greg McMahon, J. Friedl, Alexei L. Kerzin and Gennady N. Gamyanin   pp. 463-487

The Triple Group and the Platinova Gold and Palladium Reefs in the Skaergaard Intrusion: Stratigraphic and Petrographic Relations
Jens Chr. Ø. Andersen, Henrik Rasmussen, Troels F.D. Nielsen and Jørn G. Rønsbo   pp. 488-509

Borate Deposits of Northern Sonora, Mexico: Stratigraphy, Tectonics, Stable Isotopes, and Fluid Inclusions
Miguel A. Miranda-Gasca, José Arturo Gómez-Caballero and Christopher J. Eastoe   pp. 510-523
 

Scientific Communications

New ⁴⁰Ar/³⁹Ar Age Data and Implications for Porphyry Copper Deposits of Mongolia
Melissa A. Lamb and Dennis Cox   pp. 524-529
 

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